Missing comparisons and group decisions
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Having, and manipulating, a complete and consistent pairwise comparison matrix means dealing with rich and reliable information and therefore it represents the most desirable situation in a decision making problem with the AHP. However, sometimes, it is not possible for the decision maker to express all the pairwise comparisons and therefore, it is nowadays common practice to accept that some entries of a pairwise comparison matrix be missing. Let us now reprise the famous box and highlight the assumption that we are going to relax.